Issue |
A&A
Volume 425, Number 3, October III 2004
|
|
---|---|---|
Page(s) | 881 - 897 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:200400044 | |
Published online | 28 September 2004 |
Evolutionary synthesis of galaxies at high spectral resolution with the code PEGASE-HR
Metallicity and age tracers
1
Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France e-mail: leborgne@iap.fr
2
Dept. of Astronomy & Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada
3
Université Paris-Sud, 91405 Orsay Cedex, France
4
CRAL-Observatoire de Lyon, 9 Av. C. André, 69561 Saint-Genis Laval, France
5
Observatoire de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France
6
Université Pierre et Marie Curie, 4 place Jussieu, 75005 Paris, France
7
Observatoire de Bordeaux, BP 89, 33270 Floirac, France
Received:
2
May
2003
Accepted:
23
June
2004
We present PEGASE-HR, a new stellar population synthesis
program generating high resolution spectra () over the
optical range
= 400–680 nm. It links the
spectro-photometric model of galaxy evolution PEGASE.2
(Fioc & Rocca-Volmerange 1997) to an updated version of the ELODIE library of
stellar spectra observed with the 193 cm telescope at the
Observatoire de Haute-Provence [CITE]. The ELODIE star
set gives a fairly complete coverage of the Hertzprung-Russell (HR) diagram and
makes it possible to synthesize populations in the range
to +0.4.
This code is an exceptional tool for exploring signatures of
metallicity, age, and kinematics. We focus on a detailed study of
the sensitivity to age and metallicity of the high-resolution
stellar absorption lines and of the classical metallic indices
proposed until now to solve the age-metallicity
degeneracy. Validity tests on several stellar lines are performed
by comparing our predictions for Lick indices to the models of other
groups. The comparison with the lower resolution library BaSeL
[CITE] confirms the quality of the ELODIE library when
used for single stellar populations (SSPs) from 107 to
yr. Predictions for the evolved populations of
globular clusters and elliptical galaxies are given and compared to
observational data. Two new high-resolution indices are proposed
around the Hγ line. They should prove useful in the analysis
of spectra from the new generation of telescopes and spectrographs.
Key words: galaxies: stellar content / galaxies: evolution / galaxies: abundances / techniques: spectroscopic
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.